You are quite right: what people call
"metacognition" are the products of
reflection on prior constructions. The term was
created because
traditional psychologists wanted to get away from
the notion of
reflection because it pointed towards Piaget. But -
and this has to be
remembered - speaking of "reflection" does not
explain much. It serves as
a theoretically useful link (not unlike gravitation
in physics) for
something to which we can ascribe effects without
having a model of how
it works; in this case, consciousness.